To provide a comfortable and safe sleeping experience, all Serweet mattresses are fiberglass free and feature a safe flame-retardant layer to eliminate potential hazards from fiberglass or other flame-retardant chemicals. Our mattresses are skin friendly and have no skin irritations, breathing problems and health risks for you and your family, so you can really rest easy at night. This hybrid mattress features a superior 7-zone design support system that gently supports your body while providing excellent support. When you wake up in the morning, you will feel truly rested and refreshed. Color: Gray.